"I've always said Jennifer Aniston would be good," Harrison told Hollyscoop, "because she seems so unlucky in love."

But a pal of the star told Us Weekly that the 43-year-old actress' relationship with actor Theroux, 40, is a big change from her exes like Brad Pitt and John Mayer. "He makes her feel safe and secure when she's with him. A lot of her insecurities melt away," the pal told Us of the Wanderlust costars. "Their relationship is completely different than any of her other ones. Everything about Justin feels right."

And although Harrison, 40, announced in May that he and his wife, Gwen, have ended their 18-year marriage, he will not be nominating himself to be the next Bachelor. "No!" he confirmed. "I've lived behind the curtain for way too long."

But he does have a suggestion for a star he'd like to see as the next Bachelor instead — who's also currently in a relationship. "I always thought it be great to hang with George Clooney on the beach for eight weeks [that] would be awesome," he shared. "But that would be more self-serving, because maybe some of his cool would rub off on me."

George Clooney and Stacy Keibler on February 26, 2012 in Hollywood, California.Dan MacMedan/WireImage

Clooney, 51, is currently dating Stacy Keibler, 32, who has recently been the subject of pregnancy rumors. To prove them wrong, Keibler posted an Instagram photo Wednesday of herself in the gym that showed off her sexy six-pack abs.